package vtt

import (
	"os"
	"path/filepath"
	"strings"
	"testing"

	"sub-cli/internal/model"
)

func TestConvertToSubtitle(t *testing.T) {
	// Create a temporary test file
	content := `WEBVTT - Test Title

STYLE
::cue {
  color: white;
}

NOTE This is a test comment

1
00:00:01.000 --> 00:00:04.000 align:start position:10%
This is <i>styled</i> text.

2
00:00:05.000 --> 00:00:08.000
This is the second line.
`
	tempDir := t.TempDir()
	testFile := filepath.Join(tempDir, "test.vtt")
	if err := os.WriteFile(testFile, []byte(content), 0644); err != nil {
		t.Fatalf("Failed to create test file: %v", err)
	}

	// Convert to subtitle
	subtitle, err := ConvertToSubtitle(testFile)
	if err != nil {
		t.Fatalf("ConvertToSubtitle failed: %v", err)
	}

	// Check result
	if subtitle.Format != "vtt" {
		t.Errorf("Expected format 'vtt', got '%s'", subtitle.Format)
	}

	if subtitle.Title != "Test Title" {
		t.Errorf("Expected title 'Test Title', got '%s'", subtitle.Title)
	}

	// Check style conversion
	if _, ok := subtitle.Styles["css"]; !ok {
		t.Errorf("Expected CSS style to be preserved in subtitle.Styles['css'], got: %v", subtitle.Styles)
	}

	// Check entry count and content
	if len(subtitle.Entries) != 2 {
		t.Errorf("Expected 2 entries, got %d", len(subtitle.Entries))
	}

	// Check first entry
	if subtitle.Entries[0].Index != 1 {
		t.Errorf("First entry index: expected 1, got %d", subtitle.Entries[0].Index)
	}
	// The VTT parser does not strip HTML tags by default
	if subtitle.Entries[0].Text != "This is <i>styled</i> text." {
		t.Errorf("First entry text: expected 'This is <i>styled</i> text.', got '%s'", subtitle.Entries[0].Text)
	}
	if subtitle.Entries[0].Styles["align"] != "start" {
		t.Errorf("Expected align style 'start', got '%s'", subtitle.Entries[0].Styles["align"])
	}
	// 检查 FormatData 中是否记录了 HTML 标签存在
	if val, ok := subtitle.Entries[0].FormatData["has_html_tags"]; !ok || val != true {
		t.Errorf("Expected FormatData['has_html_tags'] to be true for entry with HTML tags")
	}
}

func TestConvertFromSubtitle(t *testing.T) {
	// Create a subtitle
	subtitle := model.NewSubtitle()
	subtitle.Format = "vtt"
	subtitle.Title = "Test VTT"
	subtitle.Styles = map[string]string{"css": "::cue { color: white; }"}
	subtitle.Comments = append(subtitle.Comments, "This is a test comment")
	
	// Create a region
	region := model.NewSubtitleRegion("region1")
	region.Settings["width"] = "40%"
	region.Settings["lines"] = "3"
	subtitle.Regions = append(subtitle.Regions, region)
	
	// Create entries
	entry1 := model.NewSubtitleEntry()
	entry1.Index = 1
	entry1.StartTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 1, Milliseconds: 0}
	entry1.EndTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 4, Milliseconds: 0}
	entry1.Text = "This is the first line."
	entry1.Styles["region"] = "region1"
	
	entry2 := model.NewSubtitleEntry()
	entry2.Index = 2
	entry2.StartTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 5, Milliseconds: 0}
	entry2.EndTime = model.Timestamp{Hours: 0, Minutes: 0, Seconds: 8, Milliseconds: 0}
	entry2.Text = "This is <i>italic</i> text."
	
	subtitle.Entries = append(subtitle.Entries, entry1, entry2)

	// Convert to VTT
	tempDir := t.TempDir()
	outputFile := filepath.Join(tempDir, "output.vtt")
	err := ConvertFromSubtitle(subtitle, outputFile)
	if err != nil {
		t.Fatalf("ConvertFromSubtitle failed: %v", err)
	}

	// Verify by reading the file directly
	content, err := os.ReadFile(outputFile)
	if err != nil {
		t.Fatalf("Failed to read output file: %v", err)
	}

	contentStr := string(content)
	
	// Check header
	if !strings.HasPrefix(contentStr, "WEBVTT - Test VTT") {
		t.Errorf("Expected header with title in output")
	}
	
	// Check style section
	if !strings.Contains(contentStr, "STYLE") {
		t.Errorf("Expected STYLE section in output")
	}
	
	if !strings.Contains(contentStr, "::cue { color: white; }") {
		t.Errorf("Expected CSS content in style section")
	}
	
	// Check comment
	if !strings.Contains(contentStr, "NOTE This is a test comment") {
		t.Errorf("Expected comment in output")
	}
	
	// Check region
	if !strings.Contains(contentStr, "REGION") || !strings.Contains(contentStr, "region1") {
		t.Errorf("Expected region definition in output")
	}
	
	// Check region applied to first entry
	if !strings.Contains(contentStr, "region:region1") {
		t.Errorf("Expected region style to be applied to first entry")
	}
	
	// Check HTML tags
	if !strings.Contains(contentStr, "<i>") || !strings.Contains(contentStr, "</i>") {
		t.Errorf("Expected HTML italic tags in second entry")
	}
}

func TestConvertToSubtitle_FileError(t *testing.T) {
	// Test with non-existent file
	_, err := ConvertToSubtitle("/nonexistent/file.vtt")
	if err == nil {
		t.Error("Expected error when converting non-existent file, got nil")
	}
}

func TestConvertFromSubtitle_FileError(t *testing.T) {
	// Create simple subtitle
	subtitle := model.NewSubtitle()
	subtitle.Format = "vtt"
	subtitle.Entries = append(subtitle.Entries, model.NewSubtitleEntry())

	// Test with invalid path
	err := ConvertFromSubtitle(subtitle, "/nonexistent/directory/file.vtt")
	if err == nil {
		t.Error("Expected error when converting to invalid path, got nil")
	}
}